----- Original Message -----
 You can either use the "whatis" command to get the
function
 declaration:
 
 crash> help whatis
 
 NAME
 whatis - search symbol table for data or type information
 
 SYNOPSIS
 whatis [struct | union | typedef | symbol]
 
 DESCRIPTION
 This command displays the definition of structures, unions, typedefs
 or
 text/data symbols.
 ...
 
 crash> whatis do_vfs_ioctl
 int do_vfs_ioctl(struct file *, unsigned int, unsigned int, long unsigned int);
 crash>
 
 Or print it with "p", which gives you both the declaration and its
 virtual address:
 
 crash> p do_vfs_ioctl
 do_vfs_ioctl = $14 =
 {int (struct file *, unsigned int, unsigned int, long unsigned int)}  0xffffffff811247ec
<do_vfs_ioctl>
 crash>
 
 That works. :)
 However could it be possible to show the argument without only display its type?
 The kernel is defining the do_vfs_ioctl as:
 
 int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long
arg);
 Could the "filp, fd, cmd, arg" be showed out? 
Anything from the output line could be selectively shown if you parse
the gdb output with open_tmpfile() or open_tmpfile2() if necessary.
Dave